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Your truck doesn’t leave your property. The test takes less than half an hour. Results go straight to the CARB database, and your DMV registration hold clears within 48 hours.
That’s what matters when you’re running a business in Duarte or anywhere across the San Gabriel Valley. You can’t afford to have trucks sitting at a shop for hours or parked because the DMV flagged your registration. California’s Clean Truck Check program requires OBD testing twice a year for diesel trucks with 2013 or newer engines over 14,000 pounds GVWR—and if you miss it, you’re looking at registration holds, penalties up to $10,000 per day, and trucks that can’t legally operate.
We bring the CARB-certified testing equipment to your yard, warehouse, or job site. You schedule around your day, not ours. The scan happens on-site using state-approved OBD diagnostic tools, and you get documentation immediately. No surprises, no hidden fees, and if your truck doesn’t pass, we retest for free after you address the issue.
All SMOG Motors isn’t some fly-by-night mobile testing operation. We spent 25 years as owner-operators in the construction industry before we started helping other truck owners deal with CARB compliance. We know what it’s like to get a Notice to Submit to Testing from CARB Enforcement and realize you’ve got 30 days to get your truck tested or face a registration hold.
We’re CARB-credentialed testers with over 250 Clean Truck Checks completed, including at least 50 OBD vehicle inspections. We carry $2 million in liability insurance with a Mobile Service Rider—something 99% of mobile testers don’t have. We’ve got TSA clearance to work at airports and port terminals, which means we’re trusted by utility companies, government agencies, and fleet operators who can’t afford to work with anyone who cuts corners.
Duarte sits right in the middle of the San Gabriel Valley’s industrial corridor, with construction companies, logistics operations, and service fleets running up and down the 210 and 605 every day. We’ve worked with businesses all over this area, and we understand that when CARB flags your truck, you need someone who can show up fast, test it right, and get you back to work.
First, you schedule a time that works for you. We come to your location anywhere in California with all the CARB-certified OBD testing equipment we need. This isn’t a visual inspection or a smoke test—it’s a diagnostic scan of your truck’s onboard computer system, which is what CARB requires for 2013 and newer diesel engines.
The actual test takes 15 to 30 minutes. We plug into your truck’s OBD port, run the scan, and check for emissions-related fault codes or system readiness issues. If your truck passes, we upload the results to the CARB database immediately. You get documentation on the spot, and the DMV processes the compliance within 24 to 48 hours.
If your truck doesn’t pass or shows a “not ready” status, we’ll tell you exactly what needs to be addressed. Once you fix it, we come back and retest for free. You only pay when your truck passes—no hidden fees, no charges for failed tests. We can also run pre-test diagnostics if you want to check for potential issues before the official Clean Truck Check, so you’re not caught off guard.
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Let’s be clear about what qualifies. California’s Clean Truck Check program applies to heavy-duty vehicles over 14,000 pounds GVWR with 2013 or newer diesel engines, or 2018 or newer alternative fuel engines. If your truck doesn’t meet those specs, this isn’t the service you need.
Most trucks in this category need testing twice a year. Starting in October 2027, CARB is moving to quarterly testing for OBD-equipped vehicles, so the requirements are only getting stricter. Right now, if you get a Notice to Submit to Testing from CARB Enforcement, you’ve got 30 days to pass an emissions test or the DMV puts a hold on your registration. That means your truck is grounded until you comply.
In Duarte and across Los Angeles County, CARB has been using roadside emissions monitoring and automated license plate readers since January 2023 to flag high-emitting vehicles. Even if you’ve got a CA DMV-exempt plate, you’re not off the hook—the DMV is actively placing registration holds on non-compliant trucks. We’ve helped construction companies, tow operators, delivery services, and RV owners in the San Gabriel Valley stay compliant without losing days of work. The annual Clean Truck Check fee is $31.18 as of 2024, and it goes up every year with California’s Consumer Price Index. Our mobile testing starts at $79 per passed truck, which is competitive with what you’d pay elsewhere—except we come to you, and you don’t lose half a day driving to a testing site.
If your truck fails or shows a “not ready” status, we’ll walk you through exactly what the OBD scan flagged. Usually it’s an emissions-related fault code or a system that hasn’t completed its readiness monitors yet.
You’ll need to address the issue—whether that’s a repair, a software update, or just driving the truck through a full drive cycle so the monitors reset. Once that’s done, we come back and retest for free. You don’t pay until your truck passes, so there’s no risk of paying twice for the same compliance requirement.
We can also run pre-test diagnostics before the official Clean Truck Check if you want to catch potential problems early. That way you’re not scrambling to fix something with a 30-day CARB deadline hanging over you.
Once your truck passes the Clean Truck Check, we upload the results to the CARB database immediately. The DMV typically processes the compliance and clears the registration hold within 24 to 48 hours.
You’ll get documentation from us right after the test, so you have proof of compliance if you need it before the DMV updates their system. If there’s any delay or issue with CARB’s database, we can make direct contact with CARB to resolve it quickly—something most mobile testers can’t do.
The key is not waiting until the last minute. If you’ve already got a registration hold, every day your truck sits costs you money. We offer same-day or next-day service in most cases, so you’re not stuck waiting a week for an appointment.
Yes, all heavy-duty trucks subject to the Clean Truck Check program need to be registered in the CTC-VIS (Clean Truck Check Vehicle Inspection System) portal. This is CARB’s online system for tracking compliance, scheduling tests, and managing your vehicle’s emissions testing history.
If you haven’t registered yet, we’ll help you do it for free. It’s not complicated, but it’s one more thing to deal with when you’re trying to run a business. We walk you through the process so your truck is in the system and ready for testing.
Once you’re registered, you’ll be able to see your testing schedule, compliance status, and any notices from CARB. It’s also where you’ll pay the annual Clean Truck Check fee, which is $31.18 as of 2024.
No. This service is specifically for diesel trucks with 2013 or newer engines (or 2018 or newer alternative fuel engines) that are over 14,000 pounds GVWR. That’s what CARB’s OBD testing requirement covers.
If your truck has an older engine, it might be subject to a different type of emissions test—like an opacity test or a visual inspection—but that’s not what we do. We focus exclusively on OBD testing for newer, heavy-duty trucks because that’s where the compliance requirements are most complex and where mobile testing makes the biggest difference.
If you’re not sure whether your truck qualifies, check your engine model year and your vehicle’s GVWR (it’s on the door jamb sticker). If you’re still not sure, reach out and we’ll help you figure it out.
We provide mobile CARB emissions testing anywhere in California. That includes Duarte, the entire San Gabriel Valley, Los Angeles County, and beyond. If you’ve got a truck that needs testing and you’re in the state, we’ll come to you.
Most of our clients are in the San Gabriel Valley and LA County because that’s where the bulk of California’s commercial truck traffic runs. We work with construction companies, logistics fleets, delivery services, tow operators, and independent owner-operators who need testing done without losing half a day driving to a shop.
We schedule around your operations, including after-hours and weekends if that’s what works for you. The goal is to make compliance as painless as possible so you can keep your trucks on the road and your business running.
Our mobile CARB emissions testing starts at $79 per passed truck. You only pay when your truck passes—if it fails or shows a “not ready” status, we retest for free once you’ve addressed the issue. No hidden fees, no charges for failed tests.
That’s competitive with what other mobile testers charge, and it’s a lot less than what you’d lose in downtime if you had to drive your truck to a testing site and wait around for hours. Some shops charge up to $75 just for the test, and that doesn’t include the cost of taking your truck out of service for half a day.
The annual Clean Truck Check fee that goes to CARB is separate—that’s $31.18 as of 2024, and it increases every year with California’s Consumer Price Index. But our testing fee is straightforward, and we’re upfront about what you’re paying for.
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